# File lib/rvg/misc.rb, line 134
        def shift_baseline(glyph_orientation, glyph)
            glyph_dimensions = @ctx.shadow.get_type_metrics(glyph)
            if glyph_orientation == 0 || glyph_orientation == 180
                x = glyph_dimensions.width
            else
                x = glyph_dimensions.ascent - glyph_dimensions.descent
            end
            case @ctx.text_attrs.baseline_shift
                when :baseline
                    x = 0
                when :sub
                    ;
                when :super
                    x = -x
                when /[-+]?(\d+)%/
                    m = $1 == '-' ? -1.0 : 1.0
                    x = (m * x * $1.to_f / 100.0)
                else
                    x = -@ctx.text_attrs.baseline_shift
            end
            return x
        end